402 lines
14 KiB
JavaScript
402 lines
14 KiB
JavaScript
// bridge.js — HTTP→TCP bridge for ABS (ABS_POLL + LOG/LOGBT login) using 512-byte MFC-style frames
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// Node 18+ (CommonJS)
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const express = require("express");
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const net = require("net");
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// ---- ABS endpoint (no server changes) ----
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const ABS_HOST = process.env.ABS_HOST || "192.0.0.14";
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const ABS_PORT = Number(process.env.ABS_PORT || 7000);
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// ---- transaction/opcode constants (from Abs.h / your grep) ----
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const ABS_POLL = 178; // connectivity ping
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const LOG = 100; // login transaction code
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const LOGBT = 6013; // login opcode
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const SUCCESS = 0;
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// ---- 512-byte framing ----
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const PKT_SIZE = 512;
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const PAYLOAD_PER_PKT = PKT_SIZE - 1;
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const app = express();
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// we intentionally avoid global express.json() — we accept empty bodies safely
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function readJsonBody(req) {
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return new Promise((resolve) => {
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const chunks = [];
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req.on("data", (c) => chunks.push(c));
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req.on("end", () => {
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if (!chunks.length) return resolve({});
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const txt = Buffer.concat(chunks).toString("utf8").trim();
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if (!txt) return resolve({});
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try { resolve(JSON.parse(txt)); } catch { resolve({}); }
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});
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});
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}
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// ---------- helpers: fixed-width strings, trimming ----------
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function writeFixedAscii(buf, offset, s, len) {
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const str = (s ?? "").toString();
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for (let i = 0; i < len; i++) {
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buf[offset + i] = i < str.length ? (str.charCodeAt(i) & 0xff) : 0x00;
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}
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return offset + len;
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}
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function readFixedAscii(buf, offset, len) {
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let end = offset;
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const max = offset + len;
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while (end < max && buf[end] !== 0) end++;
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const raw = buf.subarray(offset, end).toString("ascii");
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return { value: raw.trimEnd(), next: offset + len };
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}
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// ---------- struct packers / parsers (little-endian) ----------
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// sSndHeader (24 bytes)
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function packSndHeader({ nTxnCd, nOpCd = 0, nNumRecsSent = 0, nNumRecsRqrd = 0, nTxnId = 0, cBtMake = 0 }) {
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const b = Buffer.alloc(24, 0);
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let o = 0;
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b.writeInt32LE(nTxnCd, o); o += 4;
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b.writeInt32LE(nOpCd, o); o += 4;
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b.writeInt32LE(nNumRecsSent, o); o += 4;
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b.writeInt32LE(nNumRecsRqrd, o); o += 4;
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b.writeInt32LE(nTxnId, o); o += 4;
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b.writeUInt8(cBtMake & 0xff, o);
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return b;
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}
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// sRcvHeader (18 or 24 bytes on the wire)
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function parseRcvHeaderFlexible(buf) {
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if (buf.length < 18) throw new Error(`Reply too short for RcvHeader: ${buf.length} bytes`);
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let o = 0;
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const nTxnCd = buf.readInt32LE(o); o += 4;
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const nRetCd = buf.readInt32LE(o); o += 4;
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const nNumRecs = buf.readInt32LE(o); o += 4;
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const nTxnId = buf.readInt32LE(o); o += 4;
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const cBtMake = buf.readUInt8(o);
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return { nTxnCd, nRetCd, nNumRecs, nTxnId, cBtMake, size: buf.length >= 24 ? 24 : 18 };
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}
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// normalized 18-byte header (for display)
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function buildRcvHeader18({ nTxnCd, nRetCd, nNumRecs = 0, nTxnId = 0, cBtMake = 0 }) {
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const b = Buffer.alloc(18, 0);
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let o = 0;
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b.writeInt32LE(nTxnCd, o); o += 4;
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b.writeInt32LE(nRetCd, o); o += 4;
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b.writeInt32LE(nNumRecs, o); o += 4;
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b.writeInt32LE(nTxnId, o); o += 4;
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b.writeUInt8(cBtMake & 0xff, o);
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return b;
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}
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// ---------- ABS 512-byte packetization ----------
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function absSend(sock, payload) {
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return new Promise((resolve, reject) => {
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let off = 0;
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function sendNext() {
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const remaining = payload.length - off;
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const toCopy = Math.min(PAYLOAD_PER_PKT, Math.max(remaining, 0));
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const pkt = Buffer.alloc(PKT_SIZE, 0);
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pkt[0] = (off + toCopy >= payload.length) ? 48 /* '0' */ : 49 /* '1' */;
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if (toCopy > 0) payload.copy(pkt, 1, off, off + toCopy);
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off += toCopy;
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sock.write(pkt, (err) => {
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if (err) return reject(err);
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if (pkt[0] === 48) return resolve(); // last
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sendNext();
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});
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}
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sendNext();
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});
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}
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function absRecv(sock, timeoutMs = 7000) {
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return new Promise((resolve, reject) => {
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const chunks = [];
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let buf = Buffer.alloc(0);
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const timer = timeoutMs ? setTimeout(() => done(new Error("TCP timeout")), timeoutMs) : null;
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function done(err) {
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if (timer) clearTimeout(timer);
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sock.off("data", onData);
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if (err) reject(err);
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else resolve(Buffer.concat(chunks));
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}
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function onData(data) {
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buf = Buffer.concat([buf, data]);
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while (buf.length >= PKT_SIZE) {
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const pkt = buf.subarray(0, PKT_SIZE);
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buf = buf.subarray(PKT_SIZE);
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const flag = pkt[0];
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chunks.push(pkt.subarray(1));
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if (flag === 48) return done(); // '0'
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}
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}
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sock.on("data", onData);
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sock.on("error", (e) => done(e));
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sock.on("end", () => done(new Error("Socket ended before final '0' packet")));
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});
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}
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async function absRoundtrip(payload, timeoutMs = 7000) {
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const sock = new net.Socket();
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await new Promise((res, rej) => sock.connect(ABS_PORT, ABS_HOST, res).once("error", rej));
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try {
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await absSend(sock, payload);
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const replyConcat = await absRecv(sock, timeoutMs);
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sock.end();
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return replyConcat;
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} catch (e) {
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try { sock.destroy(); } catch {}
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throw e;
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}
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}
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// ---------- MFC-style password "encryption" ----------
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/*
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Mirrors the MFC EncryptPassword():
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- key = first digit of current UTC seconds
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- for each input char: interpret as digit (non-digit -> 0), add key, keep ones digit
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- append key at the end
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Result length = input.length + 1 (cPasswd in sSndLog is 11 bytes, so 10-digit inputs fit).
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*/
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function encryptPasswordLikeMFC(plain) {
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const sec = new Date().getUTCSeconds(); // GetSystemTime (UTC) seconds
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const key = Number(String(sec)[0] || "0"); // first digit
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let out = "";
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const s = (plain ?? "").toString();
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for (let i = 0; i < s.length; i++) {
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const ch = s[i];
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const d = (ch >= "0" && ch <= "9") ? (ch.charCodeAt(0) - 48) : 0; // atoi on non-digit -> 0
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out += String((d + key) % 10);
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}
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return { enc: out + String(key), key, utcSeconds: sec };
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}
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// ---------- SND/RCV: LOGIN ----------
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// sSndLog (38 bytes): cUsrId[5], cOpCardCd[17], cPasswd[11], cBtId[5]
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function packSndLog({ usrId = "", opCard, passwd, btId }) {
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const b = Buffer.alloc(38, 0);
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let o = 0;
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o = writeFixedAscii(b, o, usrId, 5);
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o = writeFixedAscii(b, o, opCard, 17);
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o = writeFixedAscii(b, o, passwd, 11);
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o = writeFixedAscii(b, o, btId, 5);
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return b;
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}
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// sRcvLog parser (follows sRcvHeader if nRetCd == 0)
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function parseRcvLog(buf, offset = 0) {
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let o = offset;
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const t1 = readFixedAscii(buf, o, 20); const cDateTime = t1.value; o = t1.next;
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const t2 = readFixedAscii(buf, o, 31); const cUsrNm = t2.value; o = t2.next;
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const t3 = readFixedAscii(buf, o, 5 ); const cUsrId = t3.value; o = t3.next;
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const t4 = readFixedAscii(buf, o, 31); const cSupNm = t4.value; o = t4.next;
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const t5 = readFixedAscii(buf, o, 5 ); const cSupId = t5.value; o = t5.next;
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const t6 = readFixedAscii(buf, o, 5 ); const cUsrTyp = t6.value; o = t6.next;
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function rf() { const v = buf.readFloatLE(o); o += 4; return v; }
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function ri() { const v = buf.readInt32LE(o); o += 4; return v; }
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const fOpenBal = rf();
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const fTktSalesByVoucher = rf();
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const fTktSalesByCash = rf();
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const fTktSalesByMemCard = rf();
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const nTktSalesByVoucherCount = ri();
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const nTktSalesByCashCount = ri();
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const nTktSalesByMemCardCount = ri();
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const fPayoutByVoucher = rf();
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const fPayoutByCash = rf();
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const fPayoutByMemCard = rf();
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const nPayoutByVoucherCount = ri();
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const nPayoutByCashCount = ri();
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const nPayoutByMemCardCount = ri();
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const fCancelByVoucher = rf();
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const fCancelByCash = rf();
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const fCancelByMemCard = rf();
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const nCancelByVoucherCount = ri();
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const nCancelByCashCount = ri();
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const nCancelByMemCardCount = ri();
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const fDeposit = rf();
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const fWithdrawAmt = rf();
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const fVoucherSales = rf();
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const fVoucherEncash = rf();
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const fCloseBal = rf();
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const fSaleTarget = rf();
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return {
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cDateTime, cUsrNm, cUsrId, cSupNm, cSupId, cUsrTyp,
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fOpenBal, fTktSalesByVoucher, fTktSalesByCash, fTktSalesByMemCard,
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nTktSalesByVoucherCount, nTktSalesByCashCount, nTktSalesByMemCardCount,
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fPayoutByVoucher, fPayoutByCash, fPayoutByMemCard,
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nPayoutByVoucherCount, nPayoutByCashCount, nPayoutByMemCardCount,
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fCancelByVoucher, fCancelByCash, fCancelByMemCard,
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nCancelByVoucherCount, nCancelByCashCount, nCancelByMemCardCount,
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fDeposit, fWithdrawAmt, fVoucherSales, fVoucherEncash,
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fCloseBal, fSaleTarget,
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size: o - offset
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};
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}
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// ---------- routes ----------
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app.get("/", (_req, res) => res.send("ABS bridge is up"));
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app.get("/health", (_req, res) => {
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const s = new net.Socket();
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s.setTimeout(1500);
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s.connect(ABS_PORT, ABS_HOST, () => { s.destroy(); res.json({ ok: true, target: `${ABS_HOST}:${ABS_PORT}` }); });
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s.on("timeout", () => { s.destroy(); res.status(504).json({ ok: false, error: "TCP timeout" }); });
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s.on("error", (e) => { s.destroy(); res.status(502).json({ ok: false, error: String(e) }); });
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});
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// ---------- ABS_POLL ----------
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app.post("/abs/poll", async (req, res) => {
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try {
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const body = await readJsonBody(req);
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const btMake = (typeof body.btMake === "string")
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? body.btMake.charCodeAt(0)
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: (Number.isFinite(body.btMake) ? (body.btMake|0) : 0x00);
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const header = packSndHeader({
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nTxnCd: ABS_POLL, nOpCd: 0, nNumRecsSent: 0, nNumRecsRqrd: 0, nTxnId: 0, cBtMake: btMake
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});
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const reply = await absRoundtrip(header, 7000);
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const headerSlice = reply.subarray(0, Math.min(reply.length, 24));
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const parsed = parseRcvHeaderFlexible(headerSlice);
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const success = parsed.nRetCd === SUCCESS;
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const normalized = {
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nTxnCd: parsed.nTxnCd || ABS_POLL,
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nRetCd: parsed.nRetCd,
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nNumRecs: parsed.nNumRecs,
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nTxnId: parsed.nTxnId,
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cBtMake: parsed.cBtMake,
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size: 18
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};
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res.json({
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ok: true,
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target: `${ABS_HOST}:${ABS_PORT}`,
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sentHeaderHex: header.toString("hex"),
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replyBytes: reply.length,
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replyHexFirst64: reply.subarray(0, 64).toString("hex"),
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parsedRcvHeaderRaw: parsed,
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normalizedRcvHeader: normalized,
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normalizedHeaderHex: buildRcvHeader18(normalized).toString("hex"),
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success
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});
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} catch (e) {
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res.status(502).json({ ok: false, error: String(e) });
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}
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});
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// ---------- LOGIN ----------
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app.post("/login", async (req, res) => {
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try {
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const body = await readJsonBody(req);
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const opCard = (body.opCard ?? "").toString();
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const btId = (body.btId ?? "").toString();
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const usrId = (body.usrId ?? "").toString();
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const plain = (body.password ?? "");
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const givenEnc = (body.passwordEnc ?? "");
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if (!opCard || !btId || (!plain && !givenEnc)) {
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return res.status(400).json({ ok: false, error: "Missing opCard, btId, and either password or passwordEnc" });
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}
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// Encrypt if only plain is supplied (MFC-compatible)
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let encInfo = null;
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let passwd = givenEnc ? String(givenEnc) : (encInfo = encryptPasswordLikeMFC(String(plain))).enc;
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const btMake = (typeof body.btMake === "string")
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? body.btMake.charCodeAt(0)
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: (Number.isFinite(body.btMake) ? (body.btMake|0) : 0x00);
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const sndHeader = packSndHeader({
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nTxnCd: LOG, nOpCd: LOGBT, nNumRecsSent: 1, nNumRecsRqrd: 1, nTxnId: 0, cBtMake: btMake
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});
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const sndLog = packSndLog({ usrId, opCard, passwd, btId });
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const sendBuf = Buffer.concat([sndHeader, sndLog]);
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const reply = await absRoundtrip(sendBuf, 10000);
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const hdrSlice = reply.subarray(0, Math.min(reply.length, 24));
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const rcvHeader = parseRcvHeaderFlexible(hdrSlice);
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const json = {
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ok: true,
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target: `${ABS_HOST}:${ABS_PORT}`,
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sentHeaderHex: sndHeader.toString("hex"),
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sentBodyHex: sndLog.toString("hex"),
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replyBytes: reply.length,
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replyHexFirst64: reply.subarray(0, 64).toString("hex"),
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rcvHeaderRaw: rcvHeader,
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success: rcvHeader.nRetCd === SUCCESS
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};
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if (!givenEnc && encInfo) {
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json.encryption = {
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used: true,
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utcSeconds: encInfo.utcSeconds,
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key: encInfo.key,
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encPasswd: passwd
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};
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} else if (givenEnc) {
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json.encryption = { used: false, providedPasswordEnc: true };
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}
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// --- adjust body offset to account for optional 4‑byte nOpCd (forward) ---
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let bodyOffset = rcvHeader.size; // 18 or 24
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if (reply.length >= bodyOffset + 4) {
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const maybeOp = reply.readInt32LE(bodyOffset);
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if (maybeOp === LOGBT || maybeOp === LOG || maybeOp === 0 || (maybeOp >= 1000 && maybeOp <= 10000)) {
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bodyOffset += 4; // explicit opcode present
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json.rcvExtraOpCd = maybeOp;
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} else {
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// if current doesn't look like '20' but +4 does, move forward
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const looksLikeYear = reply[bodyOffset] === 0x32 && reply[bodyOffset + 1] === 0x30; // '2','0'
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const looksLikeYearFwd = reply[bodyOffset + 4] === 0x32 && reply[bodyOffset + 5] === 0x30;
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if (!looksLikeYear && looksLikeYearFwd) bodyOffset += 4;
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}
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}
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// --- back guard: if we landed on '/', back up 4 to include '2025' ---
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if (bodyOffset >= 4 && reply[bodyOffset] === 0x2f /* '/' */) {
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const couldBeYear = reply[bodyOffset - 4] === 0x32 /* '2' */ &&
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reply[bodyOffset - 3] === 0x30 /* '0' */;
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if (couldBeYear) bodyOffset -= 4;
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}
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// optional: quick probe to verify alignment during testing
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json.offsetProbe = {
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bodyOffset,
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around: reply.subarray(Math.max(0, bodyOffset - 8), bodyOffset + 16).toString("ascii")
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};
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// parse body if success
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if (json.success && reply.length >= bodyOffset + 20) {
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try {
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const log = parseRcvLog(reply, bodyOffset);
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json.log = log;
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} catch (e) {
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json.parseLogError = String(e);
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}
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}
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res.json(json);
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} catch (e) {
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res.status(502).json({ ok: false, error: String(e) });
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}
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});
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// ---- start HTTP server ----
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const HTTP_PORT = Number(process.env.HTTP_BRIDGE_PORT || 8080);
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app.listen(HTTP_PORT, () => {
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console.log(`ABS HTTP bridge listening on :${HTTP_PORT}`);
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console.log(`Target ABS server: ${ABS_HOST}:${ABS_PORT}`);
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});
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